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J Appl Physiol 43: 551-556, 1977;
8750-7587/77 $5.00
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Journal of Applied Physiology, Vol 43, Issue 3 551-556, Copyright © 1977 by American Physiological Society

ARTICLES

A digital computer technique for analyzing respiratory muscle EMG's

E. N. Bruce, M. D. Goldman and J. Mead

A method is described for extracting from the electromyograms of respiratory muscles a continuous signal which has primarily the periodicity of respiratory pressure and flow wave forms. The EMG is first band-pass-filtered from 50 to 500 Hz, then digitized, full-wave rectified, passed through a nonlinear voltage window to reduce noise (particularly ECG) artifacts, then low-pass filtered with a digital continuous, or moving, averager. An average wave form corresponding to one respiratory cycle is produced by ensemble averaging of the wave forms from several consecutive breaths. Diaphragmatic electromyograms from a human and from a rabbit are processed in this manner, and the effect on the processed wave forms of changes in inspired CO2 and of a change in end-expiratory lung volume are demonstrated.


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R. S. Platt, E. A. Hajduk, M. Hulliger, and P. A. Easton
A modified Bessel filter for amplitude demodulation of respiratory electromyograms
J Appl Physiol, January 1, 1998; 84(1): 378 - 388.
[Abstract] [Full Text] [PDF]


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